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eldest son of
Gruffydd ap Llywelyn
(q.v.)
by
Senana
, and brother of
Llywelyn ap Gruffydd
. Some years a prisoner of his brother,
Dafydd ap Gruffydd
(q.v.)
,
Henry
III
secured to him a portion of
Snowdonia
by the treaty of
Woodstock
(
1247
). Again deprived by
Llywelyn
after
Bryn Derwin
(
1254
), he spent another long period in confinement, until
Llywelyn
was obliged to release him after the humiliating defeat of
1277
, and to establish him as
lord
over part of
Llŷn
. The assumption has been that he d. before the final catastrophe of
1282
, but for another view which has not much to support it, see
Trans. Cymm.
,
1899-1900
, 44-7.
Owain
was undoubtedly the worst victim of the drive against the custom of partible succession pursued by the two
Llywelyns
.

Sources:

A History of Wales: from the Earliest Times to the Edwardian Conquest
;